postgres max user defined function

pg_max_examples_sql_js_tcl.sql

create EXTENSION plv8;
create EXTENSION pltcl;

CREATE FUNCTION sql_max(integer, integer) RETURNS integer AS $$
BEGIN
	IF $1 > $2 THEN 
		RETURN $1;
	END IF;
	RETURN $2;
END;
$$ LANGUAGE plpgsql STRICT;

CREATE FUNCTION tcl_max(integer, integer) RETURNS integer AS $$
    if {$1 > $2} {return $1}
    return $2
$$ LANGUAGE pltcl STRICT;

CREATE FUNCTION v8_max(integer, integer) RETURNS integer AS $$
    if ($1 > $2) { return $1 }
    return $2
$$ LANGUAGE plv8 STRICT;

select tcl_max(2,3), v8_max(2,3), sql_max(2,3);

drop function sql_max(integer, integer);
drop function v8_max(integer, integer);
drop function tcl_max(integer, integer);